Current-controlling apparatus.



v E. L. GALE, SR. CURRENT CONTROLLING APPARATUS. APPLTOATION FILED MAY 1.1005.

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UNITED STATES PATENT QFFIEE.

ERNEST L. GALE, SE, OF

YONKERS, NEW YORK, ASSIG-NOR TO OTIS ELEVATOR COMPANY, OF EAST ORANGE, NEW JERSEY, A CORPORATION OF NEVJ JERSEY.

CURRENT-CONTROLLING APPARATUS.

Application filed ma 1, 1905. Serial No.

To all whom it may concern:

Be it known that I, ERNEST L. GALE, Sin, a citizen of the United States, and a resident of Yonkers, in the county of Westchester and State of New York, have invented a new and useful Improvement in Current- Controlling Apparatus, of which the rollowing is a specification.

My invention relates to apparatus for automatically starting and controlling electric motors.

Among the objects of the invention are to provide an improved and simplified construction which shall be reliable in operation and which will consume a minimum amount of current.

The accompanying drawing illustrates diagrammatically a system of electrical control en'lbodying my invention. The controlling mechanism as shown is employed in connection with a direct current motor, comprising an armature 1 and a shunt field winding 2. Current is supplied from any suitable source through the positive'and negative mains designated i and respectively. A sectional starting resistance 4 is adapted to be connected in series with the motor armature before the latter is started and to be gradually cut out of the armature circuit as the motor accelerates. The starting resistance is controlled by means of an electromagnet 5, the core of which in connected to a sliding contact piece 6 in engagement with a contact bar 7 and contact pieces 11, the latter being connected to the starting resistance. An electromagnctcomprising a magnet coil 8 in the main armature circuit; and a switch lever 9 connected to the core of the magnet, is adapted to maintain the armature. circuit closed after the magnet 5 has operated to close said circuit as presently described.

The parts are shown in the position assumed when the main line switch 3 is open. When the\switch 3 is closed, the motor field 2 is connected directly across the mains.

' Circuit is also established through the magnet coil 5 inseries with the motor armature. The magnet 5 being energized, lifts its core and moves the introducing tl e starting resistance t in the armature 'circuit. The core of the magnet 5 strikes the switch lever}? and moves it into engagement with the stationary contact 10,. when all of the starting resistance is in the Specification of Letters Patent.

been closed by the core contact bar 6 upward, thereby .ture circuit thereof Patented Dec. 2d, 1912.

circuit. The switch lever 9 being raised, completes the armature circuit and permits the motor to start. As the motor accelerates the counterelectromotive force rises, results mg in a corresponding reduction in the potential across the magnet 5 so that the latter is gradually weakened permitting the retarded downward movement of the contact bar 6 to gradually cutout the starting re sistance. The motor is thus permitted to run up to full speed. Afterthe switch 9 has of the magnet 5, the coil. 8 serves as a holding magnet to maintain the motor circuit until the current supply has been again cut oil. It will be observed that after the starting resistance has been cut out oi? the armature circuit as has been explained, the magnet coil 5 will be practically short-circuited as the resistance of the magnet coil S is yery low as compare with the magnet coil '5. The. latter therefore consumes only a negligible quantity 0 currentduring the normal running of the motor.

I t will be understood that .various changes might be made in the particular arrange month and construction of the controlling apparatus herein shown, and I wish therefore notto be limited to the particular arrangement shown and disclosed.

What I claim is 1. In an automatic starter for electric motors, the combination with the motor circuits, of a resistance arranged in the armature circuit thereof and having a series 9 contact surfaces, a contact member movable in sliding engagement with said surfaces in two directions to vary the resistance in said circuit, said contact member being nor-. mally in running position, electro-magnetic means arranged to move said member into the starting position when the line circuit is closed, a norinall open circuit-closing device movable by sci means to include said member in the armature circuit when sai member reaches the starting position, and an electro-magnet in the main armature circuit for holding said circuit-closing device closed while the motor is running. v

2. in .an automatic starter for electric motors, the combination with the motor circuits, ot' a resistance arranged in the armacontact surfaces, a contact i'riember movable in sliding engagement fwith said surfaces in and having a series of two directions to vary the resistance in said circuit, said contact member being normally in running" position, electromagnetic means arranged to move saidvmember into the starting position when the line circuit is closed, i normally open circuit closing device movable by said means to include said member in the armature circuit when said member reaches the starting position, and electromagnetic holding means for keeping said circuit-closing device closed While the motor is running under normal conclitions.

3.111 an automatic starter for electric Ifl'lOiIOl'S, the combination With. the motor circults, of a resistance arranged in the arms: tore circuit thereof and having a series of contort mi'fm'res, a contact member movable in sliding; engagcnnent with sa d surfaces in two directions to vary the re. tance in said circuit, said contact member being normally in running position, clectro-magnctic means arranged to more said member into the starting DOS-liifil'l ivhcn the line circuit is closed, Ll. nornmlly open circnit-closing device n'iovable by said means to include said mcmhcr in the armature circuit. when said member reaches the starting position, on electromagnetic holding means for kcc 'iint said circuitclosing device closed While the motor is running" under said circuit closing" device being}; arrange L the to open eutoma tical when clcctro magn tic holding device is clecncrgized.

L "1' i l, motoncomrolling apparatus, the

con animation with an electro-mngnct, oi starting" resistance, resistance varying an psratns i'nicrativcly connected to said electro-mag'nct, an electric switch movable to closed position hy said electro-magnet, and an additional cl-rxctro-nmgnet for holding; id switch ch ed.

*' a wit-starter, the combination with rolling circzf of a starting re Lance, a

member. a switch operatc l hy will clcctrrsmag'net when said re 'lr il11 "0, varying member reaches stm'ting position, a for nd a magnet in the mam circuit c said switch closed While said sore being; cut out and lurhis; the runningoi the motor.

is in a self-starter for electric i'notors, the combination wi electro-megnet m. the circuit in parallel t normal comlitions, f

it including an clectro-' h starting resistai'ice, of an] t n 1,048,45G7

the starting resistance, a resistance-varying member operated by said electro-megmet to control said starting resistance, a switch in the main circuit closed by said electromagnet when the resistancevarying member is in starting position, and a holding magnet for said, switch and in the main circuit.

7. In a self-starter for electric motors, the combination with a starting); resistance ini tially out of circuit, of an elcctro-nmgnet, a resistance Varying member operated by said electro-magnct, a switch in the main circuitoperatcd by said elcctro-magnet when the resistanee-varying member is in starting position, and a magnet in the main circuit for holding said switch closed.

8. .ln :1 sclfistartcr for electric motors, the combination with a starting resistance initially out of circuit, of resistance-varying apparatus, a controlling circuit including 111 clcctro-magnet for ODQlfltlnQ said resistancevarying apparatus, an automatic switch operated by said elcctrocnagnet to close the main circuit thrrmgh said startingresistance in acircuit parallel to said controlling circuit, and an additional elect-ro-n'iagnet in the main circuit for holding said automatic switch closed during the running of the motor.

9. in a selfslartm for electric motors, the combinatimi with :1 starting: resistance initially out of circuit, of a series of contacts connected to said darling resistance at intervals, a switch ineinhc I sliding engagement with said contacts, an clcctro-magnet for operating said mei'z'ilm' to insert lhc starting resistance and retard the movement of said member when the resistance is being cut out again. a. switch o'oeratm by said clectro- .niagnct when said member reaches the start ing' poafilen for closing the main circuit through mid sterling resistance, the circuit through said electroomi parallel to the st:

of two bscribingg witnesses.

l, l?) ISSEN, 

